Quarterly report pursuant to Section 13 or 15(d)

Schedule of Fair Value of Financial Instruments (Details)

v3.21.2
Schedule of Fair Value of Financial Instruments (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities $ 18,574,000 $ 1,639,000
Marketable equity securities 479,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities 479,000
Marketable equity securities 479,000  
Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities 18,095,000 1,639,000
Marketable equity securities  
Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities
Marketable equity securities  
U.S. Government Obligations [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities 2,534,000 1,014,000
U.S. Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities
U.S. Government Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities 2,534,000 1,014,000
U.S. Government Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities
Corporate Obligations [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities 15,561,000 625,000
Corporate Obligations [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities
Corporate Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities 15,561,000 625,000
Corporate Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value of marketable debt securities